And... it's a good thing I mentioned Kevin in the above. As it turns out, I may well have been missing you point. The rj-45 jack is used to connect the phone to an older codec we produced (the 220 systems). So, to cover my bases, you cannot plug the rj-45 into a network port and network the phone.

You can use LifeLink adapters to extend the micro USB connection with network cable between the adapters, but that is still a connection via the micro USB and between the phone and condec (your Icon 400). I misspoke/typed above when I said the adapter is used in the RJ-45. It is not. It is still using the micro USB.